<template>
  <div>
    <!-- 面包屑导航区域 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>参数列表</el-breadcrumb-item>
    </el-breadcrumb>

    <!-- 卡片视图区域 -->
    <el-card>
      <!-- 警告区域 -->
     <el-alert 
      show-icon 
    title="注意:只允许为第三级分类设置相关参数! "
    type="warning" :closable='false'>
      </el-alert>
      <!-- 选择商品分类区域 -->
        <el-row class="cat_opt">
                  <el-col>
                    <span>选择商品分类:</span>
                    <!-- 选择商品分类的级联选择框 -->
                    <el-cascader
              expand-trigger="hover"
              v-model="selectedCateKeys" 
              :options="catelist"
              :props="cateProps"
              @change="handleChange">
              </el-cascader>
                  </el-col>
        </el-row>
      <!-- tab 页签区域 -->
    <el-tabs v-model="activeName" @tab-click="handleTabClick">
      <!-- 添加动态参数的面板 -->
    <el-tab-pane label="动态参数" name="many">
      <!-- 添加参数的按钮 -->
      <el-button type="primary" size="mini"
      :disabled="isBtnDisabled" @click="addDialogVisible=true">添加参数
      </el-button>
      <!-- 动态参数表格 -->
      <el-table :data="manyTableData" border stripe>
        <!-- 展开行 -->
        <el-table-column type="expand">
          <template slot-scope="scope">
            <!-- 循环渲染Tag标签 -->
            <el-tag v-for="(item,i) in scope.row.attr_vals" :key="i" closable @close="handleClose(i,scope.row)">
              {{item}}
            </el-tag>
              <!-- 输入的文本框 -->
            <el-input
              class="input-new-tag"
              v-if="scope.row.inputVisible"
              v-model="scope.row.inputValue"
              ref="saveTagInput"
              size="small"
              @keyup.enter.native="handleInputConfirm(scope.row)"
              @blur="handleInputConfirm(scope.row)"
            >
            </el-input>
            <!-- 添加按钮 -->
            <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
          </template>
        </el-table-column>
        <!-- 索引列 -->
        <el-table-column type="index"></el-table-column>
        <el-table-column label="参数名称" prop="attr_name"></el-table-column>
        <el-table-column label="操作">
          <template slot-scope="scope">
          <el-button type="primary" icon="el-icon-edit" size="mini" @click="showEditDialog(scope.row.attr_id)">修改</el-button>
          <el-button type="danger" icon="el-icon-delete" size="mini" @click="removeParams(scope.row.attr_id)">删除</el-button>
          </template>
        </el-table-column>
      </el-table>
    </el-tab-pane>
      <!-- 添加静态属性的面板 -->
    <el-tab-pane label="静态属性" name="only">
       <el-button type="primary" size="mini"
       :disabled="isBtnDisabled" @click="addDialogVisible=true">添加属性</el-button>
       <!-- 静态属性表格 -->
             <el-table :data="onlyTableData" border stripe>
        <!-- 展开行 -->
        <!-- 展开行 -->
        <el-table-column type="expand">
          <template slot-scope="scope">
            <!-- 循环渲染Tag标签 -->
            <el-tag v-for="(item,i) in scope.row.attr_vals" :key="i" closable @close="handleClose(i,scope.row)">
              {{item}}
            </el-tag>
              <!-- 输入的文本框 -->
            <el-input
              class="input-new-tag"
              v-if="scope.row.inputVisible"
              v-model="scope.row.inputValue"
              ref="saveTagInput"
              size="small"
              @keyup.enter.native="handleInputConfirm(scope.row)"
              @blur="handleInputConfirm(scope.row)"
            >
            </el-input>
            <!-- 添加按钮 -->
            <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
          </template>
        </el-table-column>
        <!-- 索引列 -->
        <el-table-column type="index"></el-table-column>
        <el-table-column label="属性名称" prop="attr_name"></el-table-column>
        <el-table-column label="操作">
          <template slot-scope="scope">
          <el-button type="primary" icon="el-icon-edit" size="mini" @click="showEditDialog(scope.row.attr_id)">修改</el-button>
          <el-button type="danger" icon="el-icon-delete" size="mini" @click="removeParams(scope.row.attr_id)">删除</el-button>
          </template>
        </el-table-column>
      </el-table>
    </el-tab-pane>
    </el-tabs>
    </el-card>

    <!-- 添加参数的对话框 -->
    <el-dialog
  :title="`添加${titleText}`"
  :visible.sync="addDialogVisible"
  width="50%" @close="addDialogClosed">
  <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px">
  <el-form-item :label="titleText" prop="attr_name">
    <el-input v-model="addForm.attr_name"></el-input>
  </el-form-item>
  </el-form>
  <span slot="footer" class="dialog-footer">
    <el-button @click="addDialogVisible = false">取 消</el-button>
    <el-button type="primary" @click="addParams">确 定</el-button>
  </span>
    </el-dialog>

    <!-- 修改参数的对话框 -->
    <el-dialog
  :title="`修改${titleText}`"
  :visible.sync="editDialogVisible"
  width="50%" @close="editDialogClosed">
  <el-form :model="editForm" :rules="editFormRules" ref="editFormRef" label-width="100px">
  <el-form-item :label="titleText" prop="attr_name">
    <el-input v-model="editForm.attr_name"></el-input>
  </el-form-item>
  </el-form>
  <span slot="footer" class="dialog-footer">
    <el-button @click="editDialogVisible = false">取 消</el-button>
    <el-button type="primary" @click="editParams">确 定</el-button>
  </span>
    </el-dialog>
  </div>
</template>

<script>
export default {
  data() {
    return {
      //商品分类列表
      catelist:[],
      //级联选择框的配置对象
      cateProps:{
        value:'cat_id',
        label:'cat_name',
        children:'children'
      },
      //级联选择框双向绑定的数组
      selectedCateKeys:[],
      //被激活的页签的名称
      activeName:"many",
      //动态参数的数据
      manyTableData:[],
      //静态属性的数据
      onlyTableData:[],
      //控制添加对话框的显示与隐藏
      addDialogVisible:false,
      //添加参数的表单数据对象
      addForm:{
        attr_name:''
      },
      //添加表单的验证规则对象
      addFormRules:{
        attr_name:[{required:true,
        message:'请输入参数名称',trigger:'blur'},]
      },
      //控制修改对话框的显示与隐藏
      editDialogVisible:false,
      //修改的表单数据对象
      editForm:{},
      //修改表单的验证规则对象
      editFormRules:{
          attr_name:[{required:true,
        message:'请输入参数名称',trigger:'blur'},]
      },
    }
  },
  created() {
    this.getCateList()
  },
  methods: {
    //获取所有的商品分类列表
   async getCateList(){
     const {data:res} = await this.$http.get(`categories`)
     if(res.meta.status !== 200){
       return this.$message.error(`获取商品分类失败! `)
     }

     this.catelist = res.data

     //console.log(res.data);
    },
    //级联选择框选中项变化,会触发这个函数
    handleChange(){
     this.getParamsData()
    },
    //tab 页签点击事件的处理函数
    handleTabClick(){
      //console.log(this.activeName);
      this.getParamsData()
    },
    //获取参数的列表数据
   async getParamsData(){
     //证明选中的不是三级分类
      if(this.selectedCateKeys.length !== 3){
        this.selectedCateKeys=[]
        this.manyTableData = []
        this.onlyTableData = []
        return 
      }
      //证明选中的是三级分类
      //console.log(this.selectedCateKeys)
      //根据所选分类的Id,和当前所处的面板,获取对应的参数
      const{data:res} = await this.$http.get(`categories/${this.cateId}/attributes`,{params:{
      sel:this.activeName}
      })

      if(res.meta.status !==200){
        return this.$message.error(`获取参数列表失败`)
      }
      //console.log(res.data);
      res.data.forEach(item=>{
        item.attr_vals = item.attr_vals ? item.attr_vals.split(' ') : []
        //控制文本框的显示与隐藏
        item.inputVisible = false
        //文本框中输入的值
        item.inputValue=''
      })
      //console.log(res.data);
      if(this.activeName === 'many'){
        this.manyTableData = res.data
      }else{
        this.onlyTableData = res.data
      }
    },
    //监听添加对话框的关闭事件
    addDialogClosed(){
    this.$refs.addFormRef.resetFields()
    },
    //点击按钮,添加参数
     addParams(){
      this.$refs.addFormRef.validate(async valid=>{
        if(!valid) return
       const{data:res} = await this.$http.post(`categories/${this.cateId}/attributes`,{
          attr_name:this.addForm.attr_name,
          attr_sel:this.activeName
          })

          if(res.meta.status !==201){
            return this.$message.error(`添加参数失败! `)
          }

          this.$message.success(`添加参数成功! `)
          //隐藏对话框
          this.addDialogVisible = false
          //刷新数据列表
          this.getParamsData()
     })
    },
    //点击按钮,展示修改的对话框
    async showEditDialog(attr_id){
      //查询当前参数的信息
     const{data:res} = await this.$http.get(`categories/${this.cateId}/attributes/${attr_id}`,{params:{attr_sel:this.activeName}})

     if(res.meta.status !==200){
       return this.$message.error(`获取参数信息失败! `)
     }
      this.editForm = res.data

      this.editDialogVisible = true
    },
    //重置修改的表单
    editDialogClosed(){
      this.$refs.editFormRef.resetFields()
    },
    //点击按钮,修改参数信息
    editParams(){
     this.$refs.editFormRef.validate(async valid=>{
       if(!valid) return
       const{data:res} = await this.$http.put(`categories/${this.cateId}/attributes/${this.editForm.attr_id}`,{
         attr_name:this.editForm.attr_name,
         attr_sel:this.activeName
       })

       if(res.meta.status!==200){
         return this.$message.error(`获取参数失败! `)
       }

       this.$message.success(`修改参数成功! `)
       this.getParamsData()
       this.editDialogVisible = false
     })
    },
    //根据Id删除对应的参数项
    async removeParams(attr_id){
       const confirmResult = await this.$confirm('此操作将永久删除该参数, 是否继续?', '提示', {
          confirmButtonText: '确定',
          cancelButtonText: '取消',
          type: 'warning'
        }).catch(err=>err);
        //如果用户取消了删除的操作
        if(confirmResult !=='confirm'){
         return this.$message.info(`已取消删除! `)
        }     
        //删除的业务逻辑
        const{data:res} = await this.$http.delete(`categories/${this.cateId}/attributes/${attr_id}`)

        if(res.meta.status!== 200){
          return this.$message.error(`删除参数失败! `)
        }
        this.$message.success(`删除参数成功! `)
        this.getParamsData();
        },
    //文本框失去焦点,或摁下了Enter都会触发的事件
   async handleInputConfirm(row){
      if(row.inputValue.trim().length===0){
        row.inputValue = ''
        row.inputVisible = false
        return
      }
       //如果没有return,则证明输入的内容,需要做后续处理
       row.attr_vals.push(row.inputValue.trim())
       row.inputValue = ''
       row.inputVisible = false
       //需要发起请求,保存这次操作
       this.saveAttrVals(row)
     },
     //将对attr_vals的操作,保存到数据库
      async saveAttrVals(row){
      //需要发起请求,保存这次操作
      const{data:res} = await this.$http.put(`categories/${this.cateId}/attributes/${row.attr_id}`,
      {
         attr_name: row.attr_name,
         attr_sel: row.attr_sel,
         attr_vals: row.attr_vals.join(' ')
       }
       )  
       if(res.meta.status!==200){
         return this.$message.error(`修改参数项失败! `)
       }
       
       this.$message.success(`修改参数项成功! `)
      },
      //点击按钮,展示文本输入框
      showInput(row){
        row.inputVisible=true
        //让文本框自动获得焦点
        //$nextTick方法的作用,就是当页面上元素被重新渲染之后,才会指定回调函数中的代码
         this.$nextTick(_ => {
          this.$refs.saveTagInput.$refs.input.focus();
        });
      },
      //删除对应的参数可选项
      handleClose(i,row){
       row.attr_vals.splice(i,1)
       this.saveAttrVals(row)
      }
  },
  computed:{
    //如果按钮需要被禁用则返回true,否则返回false
    isBtnDisabled(){
      if(this.selectedCateKeys.length!==3){
        return true
      }
      return false
    },
    //当前选中的三级分类的Id
    cateId(){
      if(this.selectedCateKeys.length===3){
        return this.selectedCateKeys[2]
      }
      return null
    },
    //动态计算标题的文本
    titleText(){
      if(this.activeName === 'many'){
        return '动态参数'
      }else{
        return '静态属性'
      }
    }
  }
}
</script>

<style lang="less" scoped>
.cat_opt{
  margin: 15px 0;
}
.el-popper{
    top: 210px !important;
}
.el-col:first-child span{
  margin-right: 10px;
}
.el-tag{
  margin: 10px;
}
.input-new-tag{
  width: 150px;
}
</style>
